Electromagnetic flowmeter sensor check

Electromagnetic flowmeter sensor inspection: Test equipment: a 500MΩ insulation resistance tester and a multimeter.

Test steps: (1) When the pipe is filled with medium, use a multimeter to measure the resistance value between terminals A, B and C. The resistance values ​​between A-C and B-C should be as large as possible. If the difference is more than 1 time, it may be that the electrode is leaking or there is condensed water adsorbed on the outer wall of the measuring tube or in the junction box.

(2) When the lining is dry, use a MΩ meter to measure the insulation resistance between A-C and B-C (should be greater than 200MΩ). Then use a multimeter to measure the resistance of terminals A and B and the two electrodes in the measuring tube (it should be in a short-circuit state). If the insulation resistance is very small, it means the electrode is leaking, and the entire flow meter should be returned to the factory for repair. If the insulation has declined but is still above 50MΩ and the inspection result in step (1) is normal, the outer wall of the measuring tube may be damp, and a hot air blower can be used to dry the inside of the casing.

(3) Use a multimeter to measure the resistance between X and Y. If it exceeds 200Ω, the excitation coil and its lead wire may be open circuit or have poor contact. Remove the terminal board and inspect.

(4) Check the insulation resistance between X, Y and C. It should be above 200MΩ. If it drops, use hot air to dry the inside of the shell. During actual operation, the reduction in coil insulation will lead to increased measurement errors and unstable instrument output signals.

(5) If it is determined that the sensor is faulty, please contact the electromagnetic flowmeter manufacturer. Generally, it cannot be solved on site and needs to be repaired by the manufacturer.

Converter inspection

If it is determined that the converter is faulty and there are no external causes, please contact the electromagnetic flowmeter manufacturer. The manufacturer will generally replace the circuit board. Solution

Electromagnetic flowmeter sensor inspection: Shanghai Anrui Automation Instrument Co., Ltd. is a comprehensive professional enterprise integrating scientific research and development, manufacturing, marketing and engineering services of industrial automation products. At the same time, the company relies on large scientific research units such as the Beijing Sensing Technology Center, the Institute of Mechanics, the Institute of Acoustics, and the Ministry of Aerospace of the Chinese Academy of Sciences, and has formed long-term scientific research cooperation relationships with universities such as Tsinghua University.